| 摘要 |
A heat pump employing CO 2 as refrigerant and utilizing heat source of natural water, e.g. well water, ground water, river water or sea water, effectively is applied to an air conditioning system in order to enhance heating/hot water supplying capacity and refrigeration capacity without requiring a large scale appurtenant facilities. A first stopper valve (5) is provided in parallel with a first expansion valve (4) on the downstream side of a compressor, a heat exchanger (6) performing heat exchange with natural water is provided on the downstream side of the first stopper valve (5) and the first expansion valve (4), a second stopper valve (8) is provided in parallel with the second expansion valve (7) on the downstream side of the heat exchanger, and an evaporator (9) for evaporating the refrigerant by taking evaporation latent heat from cold water is provided on the downstream side of the second stopper valve (8) and the second expansion valve (7) . When heating/hot water supplying operation is performed, the first stopper valve (5) is closed and the second expansion valve (7) is opened. When heating/hot water supplying/refrigerating operation is performed, opening/closing of the stop valves is reversed.
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